package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 *@Author guoshiyi
 *@Date 2025/5/23 21:11
 */
@Slf4j
@Service
public class UserServiceImpl implements UserService {
    private static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatProperties weChatProperties;
    /**
     * 微信登录
     *
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wechatLogin(UserLoginDTO userLoginDTO) {
        /**
         * 微信登录
         * @param userLoginDTO
         * @return
         */
            String openid = getOpenid(userLoginDTO.getCode());

            //判断openid是否为空，如果为空表示登录失败，抛出业务异常
            if (openid == null) {
                throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
            }

            //判断当前用户是否为新用户
            User user = userMapper.getByOpenid(openid);

            //如果是新用户，自动完成注册
            if (user == null) {
                user = User.builder()
                        .openid(openid)
                        .createTime(LocalDateTime.now())
                        .build();
                userMapper.insert(user);//后绪步骤实现
            }

            //返回这个用户对象
            return user;
        }

        /**
         * 调用微信接口服务，获取微信用户的openid
         * @param code
         * @return
         */
        private String getOpenid (String code){
            //调用微信接口服务，获得当前微信用户的openid
            Map<String, String> map = new HashMap<>();
            map.put("appid", weChatProperties.getAppid());
            map.put("secret", weChatProperties.getSecret());
            map.put("js_code", code);
            map.put("grant_type", "authorization_code");
            String json = HttpClientUtil.doGet(WX_LOGIN, map);

            JSONObject jsonObject = JSON.parseObject(json);
            String openid = jsonObject.getString("openid");
            return openid;
        }
    }
